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NewGVN: Remove DebugUnknownExprs, just mark the instructions as unused

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llvm-svn: 297047
This commit is contained in:
Daniel Berlin 2017-03-06 18:42:39 +00:00
parent d8ed5be547
commit ca88a4e71d
1 changed files with 3 additions and 7 deletions
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10
lib/Transforms/Scalar/NewGVN.cpp
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@ -289,8 +289,6 @@ class NewGVN : public FunctionPass {
// Deletion info.
SmallPtrSet<Instruction *, 8> InstructionsToErase;
// The set of things we gave unknown expressions to due to debug counting.
SmallPtrSet<Instruction *, 8> DebugUnknownExprs;
public:
static char ID; // Pass identification, replacement for typeid.
NewGVN() : FunctionPass(ID) {
@ -1718,7 +1716,6 @@ void NewGVN::cleanupTables() {
DominatedInstRange.clear();
MemoryAccessToClass.clear();
PredicateToUsers.clear();
DebugUnknownExprs.clear();
}
std::pair<unsigned, unsigned> NewGVN::assignDFSNumbers(BasicBlock *B,
@ -1815,9 +1812,8 @@ void NewGVN::valueNumberInstruction(Instruction *I) {
if (DebugCounter::shouldExecute(VNCounter)) {
Symbolized = performSymbolicEvaluation(I);
} else {
// Used to track which we marked unknown so we can skip verification of
// comparisons.
DebugUnknownExprs.insert(I);
// Mark the instruction as unused so we don't value number it again.
InstrDFS[I] = 0;
}
// If we couldn't come up with a symbolic expression, use the unknown
// expression
@ -1934,7 +1930,7 @@ void NewGVN::verifyComparisons(Function &F) {
if (!ReachableBlocks.count(&BB))
continue;
for (auto &I : BB) {
if (InstructionsToErase.count(&I) || DebugUnknownExprs.count(&I))
if (InstrDFS.lookup(&I) == 0)
continue;
if (isa<CmpInst>(&I)) {
auto *CurrentVal = ValueToClass.lookup(&I);